Influence of multi-oxidants on reaction characteristics of PTFE-Al-XmOY reactive material

Jia, Lei; Liu, Jinxu; Zhang, Song; Xue, Xiaopeng; He, Chuan; Wu, Zhouyang; Yang, Min; Li, Shukui

doi:10.1016/j.matdes.2019.108325

Cited by 29 publications

(7 citation statements)

References 18 publications

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“…This temperature rise caused a rapid expansion of the SiF 4 gas and the subsequent pressure rise. The pressurization rate experiments were carried out using a special-designed vessel with a 220 mL internal volume, and the detail of the experimental setup can be found elsewhere [ 35 ]. The pressurization rate of the PTFE/Si EMs of a similar composition was measured to be 5.75 MPa/s, and the peak pressure was determined to be 0.545 MPa (see Supplementary Figure S4 ).…”

Section: Resultsmentioning

confidence: 99%

Energetic-Materials-Driven Synthesis of Graphene-Encapsulated Tin Oxide Nanoparticles for Sodium-Ion Batteries

et al. 2021

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By evenly mixing polytetrafluoroethylene-silicon energetic materials (PTFE-Si EMs) with tin oxide (SnO2) particles, we demonstrate a direct synthesis of graphene-encapsulated SnO2 (Gr-SnO2) nanoparticles through the self-propagated exothermic reaction of the EMs. The highly exothermic reaction of the PTFE-Si EMs released a huge amount of heat that induced an instantaneous temperature rise at the reaction zone, and the rapid expansion of the gaseous SiF4 product provided a high-speed gas flow for dispersing the molten particles into finer nanoscale particles. Furthermore, the reaction of the PTFE-NPs with Si resulted in a simultaneous synthesis of graphene that encapsulated the SnO2 nanoparticles in order to form the core-shell nanostructure. As sodium storage material, the graphene-encapsulated SnO2 nanoparticles exhibit a good cycling performance, superior rate capability, and a high initial Coulombic efficiency of 85.3%. This proves the effectiveness of our approach for the scalable synthesis of core-shell-structured graphene-encapsulated nanomaterials.

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Section: Resultsmentioning

confidence: 99%

Energetic-Materials-Driven Synthesis of Graphene-Encapsulated Tin Oxide Nanoparticles for Sodium-Ion Batteries

et al. 2021

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“…For fluoropolymer-based RMs, according to the SEM of PTFE/Al (73.5/26.5) RM [ 26 ] (shown in Figure 2 a), the pores which will collapse under impact compression and form hotspots mainly appear inside the PTFE matrix. Meanwhile, in condensed RM without fragmentation, only extremely high temperatures (over 900 K [ 27 ]) can lead to direct reactions between PTFE and Al. Therefore, in the impact ignition stage, the calculation of the hotspots effect is assumed to exclude the energy released by chemical reactions and the mechanical deformation and heat transfer are counted for the temperature rise of the RM.…”

Section: Impact Ignition Behavior Of Rmmentioning

confidence: 99%

Theoretical Model for the Impact-Initiated Chemical Reaction of Al/PTFE Reactive Material

Liu

et al. 2022

Materials

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Reactive material (RM) is a special kind of energetic material that can react and release chemical energy under highly dynamic loads. However, its energy release behavior is limited by its own strength, showing unique unsustainable characteristics, which lack a theoretical description. In this paper, an impact-initiated chemical reaction model is proposed to describe the ignition and energy release behavior of Al/PTFE RM. The hotspot formation mechanism of pore collapse was first introduced to describe the decomposition process of PTFE. Material fragmentation and PTFE decomposition were used as ignition criteria. Then the reaction rate of the decomposition product with aluminum was calculated according to the gas-solid chemical reaction model. Finally, the reaction states of RM calculated by the model are compared and qualitatively consistent with the experimental results. The model provides insight into the thermal-mechanical-chemical responses and references for the numerical simulation of impact ignition and energy release behavior of RM.

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“…The study of PAB is just beginning. Lan Jia [ 17 ] tested the reaction energy and combustion rate of various ternary reactive materials and filmed the shock-induced chemical reaction process of reactive materials under the split Hopkinson pressure bar test with a high-speed camera. The test results showed that PAB had the best combustion performance, prolonged reaction duration, and a significant gas production rate.…”

Section: Introductionmentioning

confidence: 99%

Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi2O3 Reactive Materials under Drop-Hammer Test

Jiang

Mao

et al. 2022

Polymers

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To obtain the influence of the Bi2O3 particle content of a PTFE/Al/Bi2O3 reactive material (later referred to as PAB) on its shock-induced chemical reaction (SICR) characteristics, five kinds of PAB with different Bi2O3 contents were prepared; the reaction process in a drop-hammer test, recorded using a high-speed camera, was analyzed. The ignition and reaction mechanisms of PAB under mechanical impact were analyzed based on the thermochemical reaction characteristics and the microstructure. The results show that with an increase in Bi2O3 content, the shock-induced chemical reaction duration and the sensitivity of PAB increase, and then decrease. When the Bi2O3 content is 9%, the impact sensitivity is the highest and the reaction duration is the longest. The heating at the crack tip is responsible for PAB ignition under long-pulse low-velocity impact. During ignition, PAB undergoes several physicochemical changes such as the melting of PTFE, a PTFE/Bi2O3 reaction, an Al/Bi2O3 reaction, pyrolysis of the melted PTFE, and a C2F4/Al reaction; moreover, the presence of Bi2O3 decreases the excitation threshold of the reactive material, which facilitates the propagation of the reaction and improves the degree of the reaction and overall energy release of the reactive material.

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Influence of multi-oxidants on reaction characteristics of PTFE-Al-XmOY reactive material

Cited by 29 publications

References 18 publications

Energetic-Materials-Driven Synthesis of Graphene-Encapsulated Tin Oxide Nanoparticles for Sodium-Ion Batteries

Energetic-Materials-Driven Synthesis of Graphene-Encapsulated Tin Oxide Nanoparticles for Sodium-Ion Batteries

Theoretical Model for the Impact-Initiated Chemical Reaction of Al/PTFE Reactive Material

Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi2O3 Reactive Materials under Drop-Hammer Test

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